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Interface-Engineered Composite Self-Assembled Monolayers Driving Efficient and Stable Wide-Bandgap Perovskite and
Qingquan He1, Xinquan Wang1, Gang Xu1
1Science and Education Integration, College of Energy and Carbon Neutralization, College of Materials Science and Engineering, Zhejiang Provincial Key Laboratory of Clean Energy Conversion and Utilization, State Key Laboratory of Green Chemical Synthesis and Conversion, Zhejiang University of Technology, Hangzhou 310014, P. R. China.
Researchers developed a new composite SAM strategy to improve wide-bandgap perovskite solar cells (PSCs). This method enhances efficiency and stability, achieving a 22.40% PCE for PSCs and 30.74% for tandem cells.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Wide-bandgap perovskite solar cells (WBG PSCs) show promise but suffer from poor wettability, defects, and energy misalignment.
- Self-assembled monolayers (SAMs) are used to improve PSCs, but further optimization is needed for performance and longevity.
Purpose of the Study:
- To develop an interface regulation strategy for enhancing WBG PSCs and perovskite/silicon tandem solar cells.
- To address challenges in film formation, defect passivation, and energy-level alignment in WBG PSCs.
Main Methods:
- A multifunctional composite SAM (Co-SAM) was engineered using tris(4-carboxyphenyl)phosphine oxide (TC) modified [4-(7H-benzimidazol-7-yl)butyl]phosphonic acid (4PADCB).
- The Co-SAM strategy was applied to fabricate 1.68 eV WBG PSCs and perovskite/silicon tandem solar cells.
Main Results:
- The Co-SAM significantly improved interfacial wetting, perovskite crystallization, defect passivation, and energy-level alignment.
- WBG PSCs achieved a champion power conversion efficiency (PCE) of 22.40% with 1.68 eV bandgap.
- Devices maintained over 90% of initial efficiency after 1440 hours of ambient storage.
- Perovskite/silicon tandem solar cells reached a PCE of 30.74%.
Conclusions:
- The developed Co-SAM strategy offers a new paradigm for interfacial molecular engineering in photovoltaics.
- This approach leads to highly efficient and operationally stable WBG PSCs and tandem solar cells.
- The findings pave the way for advanced, stable, and efficient next-generation solar energy technologies.
